Mortar box



March 13, 1928.

E. E. PERRITT MORTAR Box Filed April 28, 1927 Patented Mar. 13, 1928.

UNITED STATES Laarzen ELLIOTT E. PERRITT, OF PITTSBURGH, PENNSYLVANIA.

MORTAR Box.

Application filed April 28, 192'?. Serial No.` 187,148.

The invention relates to an improvement in motar boxes.` It has for its principal Objects the provision of an improved box of sheet steel, which has a minimum number of plates and joints or seams, which can be cheaply constructed, and which is very rigid and durable. One embodiment of the invention is shown in the accompanying drawings, wherein:

Figure l is a plan View of the box. Figs. 2 and 3 are sections on the lines II-II and III-IIL respectively, of Fig. l. Fig. 4 is an enlarged partial section also on the rline III-III oi' Fig. i. Figs. y5 and 6 are enlarged detail sections through one of the seams. And Fig. 7 is an enlarged plan view at one of the corners of the box.

The box is made up ot three sheet steel plates only, namely, the bottom plate l, which has the inclined ends 2, 2, and the two side plates 3, 3. The bottom plate is secured at its edges to the side plates by the seam construction shown in detail in Fig. 6.

The side plate 3 has its lower edge bent in- Ward forming the fian'ge 4, while the bottom plate l is extended over the top of the flange, as indicated at 5 and ythen extended around such flange in the lap 6 of U-shape in cross section, whose free end is turned up along the outer side of the plate 3, as indicated at 7. This seam is formed by a machine operation, so that the various laps of metal are clamped tightly together, thus making a secure union and one which is tight enough for. the intended purpose without soldering. This form of seam with the plurality of laps of metal is desirable here as a stiifening means for the box, and in order to withstand the hard usuage to which the edges of a box of this type, which is carried around from place to place, is exposed.

The upper edges of the inclined ends 2, 2

are reinforced by the angle irons 8, 8 (Fig. 2), while the upper edges of the sides 3, 3 are reinforced by the angle irons 9,A 9. The sheet metal, after being bent around the angle irons, is securely held by the rivets` l0 spaced at intervals of six or eight inches. At the corners of the box, the folded over corner edges of the sheets 2, 2 are extended across or between the folded over edges of the sides 3, 3, as indicated in Fig. 7. The end of the angle iron 8 is cut olf short of the corner of the box, as shown by the line l2, but the horizontal iiange of the angle iron 9 is extended through to the point 13, the vertical flange offsuch angle iron being cut off short or the corner oi' the box` at the point lll. This arrangement at each corner provides iive overlapping layers ot metal at such points, and these layers are fastened `securely together by the rivets l2.

' The side sheets 3, 3 with the seam reinforce ing along the bottom edges andthe angle iron reinforcing along the upper edges, practically form longitudinal trusses forv the box, making it very strong and stid, and permitting the use of much lighter sheet metal thangwould otherwise be possible. The rectangle formed by the four upper edges reinforced by the` angle irons and riveted together at the corners of the box,

also greatly stii'ens the box and prevents it virom being deformed during handling or by rough usuage. The box, because of its simple constructirm, requiring, as it does, only three separate sheets of metal, and having only ltwo seams, can be made yat a low cost and will give a long period of service.

The overlapping and interitting of the lapped over edges or' the sheets at the corners, as shown in Fig. 7, gives the box a finished appearance at these points and also gives additional strength at points especially exposed to rough usage. The arrangement oit the cross angle irons 8, 8 as indicated in Fig. 2 with the outer flange inclinded downwardly instead ot lying horizontally, also involves certain advantages, one of which is the additional stiliness of a rightangle iron over one having an angle greater than a right angle, and another .of which is the `secure grip for the hands, this being pro- "vided by the downwardlyinclined iiange,

thus avoiding the necessity of equipping the box with handles.

,ilVhat I claim is: Y.

l.. A mortar box of sheet metal comprising a bottom sheet inclined upwardly at its ends to forinthe end walls of the box, and a pair ot side plates, each secured rigidly at its bottom and inclined end edges to the side edges of said bottom plate, a reinforcin angle iron at the upper edge of each of saik ends and each of said side plates, around which angle irons saidv edges are bent and positively secured, said bent upper edges extending past each other and overlapping at the corners of the box, and' means for rigidly securing said cverlappiing edges rigidly together.

2. A mortar box of sheet metal comprising :i bottom Sheet inclined upirzu'dl;v :itz its ends to torni the end Walls of the box. :ind :i pfiir of side plotes eiieh secured rigidly :it iti2 hottoni and end edges to the side edges of' sind bottom plate, :1nd :i reinforcing :ingle :it the upper edge ot' eneh of said end 'allev :ind euch of Said Ieide plates, :iround which :ingle irene #nid edge?y :1re bentI :tud Secured, the :ingle irene :it the ends of the box having! their outer flange@ throughout the length o t Froid ends :it :iii :ingle of :ibout: ninety degrees to sfiid end welle, thus providing` liitine hfinillef-v for the box.

3. A niortfir box oi" Sheet inetfil eoniprining :i bottoni Sheet inelined upwardly :it its ends to 'forni the end mille-i of the box. und :i piiir of side plates, eiieh .eeeured rigidly at its bottom and end edges to the Side edges of sind bottom plate, :ind :i renforeiing :ingle :it the upper edge 0i: eiieh of Suid end Walls :ind eiieh oi' Suid `side pinten, :iround which :ingle irons Suid edges :ire lient :ind secured. the, :infile iron :it the ends ot the box having their outer thingjes throughout the length of #nid end,Q :it :in angle of :ihont ninety defrees to sziid end wnlln. thus providing! litt iner hiindle for the box. :ind said lient upper edges extending past eiieh other :ind overlappingl :it the corners of the box :ind being rigidly secured together.

ln teatinioiri7 Whereoi`` I hure hereunto lQuhserihed iiijig nnnie thi."` 25th dziy ot' April.` i927.

ELLIOTT E. PERRIT. 

